I hadn't, until I came across an article in the Telegraph mentioning it and a number of other 'male-prefix' words. In case you were wondering, a 'guybrator' is a male vibrator (whatever the hell that is, and I don't want to know!)
See how many of these terms you understand:
They're all explained in the article, along with several others. Clearly, I've led a sheltered existence, as most are new to me . . .